Preheater



Nov. 21, 1950 N. A. ARVINS EI'AL PREHEATER 2 Sheets-Sheet 2 Filed Novv11, 1944 INVENTORS NHTHQN Fl. H RVINS FIBRQ HAM H. F! RVINTZ BY ATTOR EYPatented Nov. 21, 1950 PREHEATER Nathan A. Arvins and Abraham A.Arvintz, Brooklyn, N. Y., assignors to Blazel Corporation, a corporationof New York Application November 11, 1944, Serial No. 563,028

3 Claims.

This invention relates to preheaters primarily used for preheating fueloil for supply to oil burners of various kinds and classes. More particularly, the invention relates to apparatus of this kind havingyieldable means compensating for expansion and contraction of thecirculating unit andthe casing or jacket therefor, in order to preventstresses or strains on the unit. Further, the invention includes the useof a coil, through which the heating medium is circulated and thearrangement of this coil in the jacket or casing of the apparatus toheat a transfer medium contained therein for heating the circulatingcoils of said unit. Still further, the invention include means forcirculating the medium in the casing or jacket to provide more efficientheat conductivity and to eliminate dead pockets in the apparatus.

Some features shown and described herein are claimed in our divisionalapplication No. 726,420, filed February 4, 1947.

The novel features of the invention will be best understood from thefollowing description when taken together with the accompanying drawing,in which certain embodiments of the invention are disclosed and in whichthe separate parts are designated by suitable reference characters ineach of the views and in which:

Fig. 1 is a longitudinal sectional view through an apparatus madeaccording to our invention with the central portion of the apparatusbroken away.

Fig. 2 is a section on the line 2-2 of Fig. 1 on a reduced scale.

Fig. 3 is a section on the line 33 of Fig. 1 on a reduced scale; and

Fig. 4 is a sectional view at right angles to Fig. 1 showing one endportion only of the preheater.

In the accompanying drawing, l represent the main casing or jacket ofthe preheater apparatus. The ends of the casing have outwardlyprojecting annular flanges H and I2. The end portions of the casing,adjacent the flanges, have ports [3,14, l5 and I6 which, in theconstruction shown, are closed by plugs l1, l8, l9 and 20. However, insome instances, these passage 26 in the header. The header also has anoil outlet passage 21 which communicates with another passage 28 in theheader. Between the passages 25 and 28 is a chamber 29.

At 30 is shown a circulating coil or tube unit. This unit comprises endplates 3| and 32, in which are supported a plurality of circulatingtubes, part of which are shown in Fig. 1 of the drawing. The tubes 33communicate with the ports may be used to circulate a heating ortransfer medium through a chamber 2| of the casing 10.

At one end of the casin 10 and detachable with respect to the flange I2is an oil distributing casing or header 22 having an annular flange 23secured to the flange l2 by circumferentially spaced bolts 24. An oilinlet pipe 25 is coupled with the header 22 and communicates with-apassage 26 at one end and the other end communicates with a chamber 34in a header 35, the header having a central partition, as seen at 3B.Thus, oil circulating through the tubes 33 into the chamber 34 will thencirculate back through the tubes 31 into the lower portion of thechamber 29. The oil will then pass from the chamber 29 through the tubes38 into the other chamber 39 of the header 35, the oil being dischargedfrom the chamber 39 through the tubes 40 which open into'the passage 28.From the foregoing, it will appear that a back and forth circulationamounting to what may be termed four passes is provided.

The header 35 includes an annular coupling flange 4| secured to the endplate 3| by bolts 42. These bolts also pass through an intermediatemounting ring 43 having gaskets 44 at both sides thereof. The ring. 43is coupled with another larger mounting ring 45 through the medium of ayieldable coupling 46 welded or otherwise secured to each of the rings43, 45 and of U-shaped cross-sectional form. The coupling 46 provides anexpansion coupling between'the unit 30 or-the header end 35 of said unitand the corresponding end of the casing l0, bolts 41 being employed tosecure the mounting ring 45 to the flange H of the casing i II.

The chamber 2| opens into an annular chamber 48 in the header 22, asseen at 49.

The chamber 48 completely envelopes the annular reduced portion 50 ofthe header, within which the passages 26, 28 and 29 are arranged, aswill clearly appear from a consideration of Fig, 3 of the drawing.

The reduced portion 50 has an end wall 51 which terminates short of theend wall 52 proper of the header 22 and this forms between the walls 5|and 52 a circulating chamber 53 which jackets the outer portion of thepassages 26, 28 and 29, except where the tubular connectors 26a and 28abridge the walls 5! and 52; thus, it may be said that the chambers 26,28 and 29 are completely jacketed on outer surfaces thereof.

Centrally of the reduced portion 50 of the header 22 and centrally ofthe chamber 29 is a.

conical tube 54, with which is coupled a circulati pipe 55 which extendscentrally through the chamber 2| to a point short of the plate 3|, asseen at 56. The tube 54 provides a further jacket ing of the chamber 29and this tube opens into the chamber 53.

Centrally of the header 22 and in alinement with the tube $4 :is anopening 5'! closed by a plate 58, in which is mounted a propeller shaft59 driven by any suitable means for driving the propeller blades 60,disposed in the chamber 53 at the flared end of the conical tube 54. Asuitable packing gland BI is mounted on the plate 58 and around theshaft 59. Withthis construction, water or any other fluid heatconducting medium can be circulated through the casing 2| by forcing thefluid through the tube 55 and into the end of the chamber 2| at thedischarge end 56 of said tube and this fluid will then circulate backand enter the chamber 53. In this Way, the heatingun'edium or transfermedium may be kept in :constant circulation to provide efiicient heating"of the oil circulated through the tubes of the unit 36, {as qireviouslydescribed.

' .The end :plate 232 of the .unit 35 is bolted or ptherwisesecured'tothe inner end of the reduced portion iiiof the header 22, as seen at62 and suitable packings =63 are provided between the ip1ateZ-32andareduced portion 50 and a packing -64-is also provided ibetweentheflanges l2 and 23. In like-manner, packings 65 are employed between the:flange -H :and 'the mounting ring 45.

The header 22 has upper and lower passages Tfifiand r61 ,-the latterforming an intakefor water or otherzfiuidto be introduced into thechamber 2|; whereas :thepassage 66 may be used as an outlet in the eventthat a forced circulation is desired through the chamber 2| independentof the circulation previously described. However, when -no circulationis provided, the passage 65 serves as .meansfor placing gauge devices ofother controls commonly employed in apparatus of the kind underconsideration, particularly in the control of temperatures in the wateror other medium :arranged in the chamber 2|, but these devices are notshown, as they form no part of the present invention.

-Mounted :in the lower portion of the header :22 is 'an inlet pipe 68which passes through a .gland'ts in the header and this pipe forms oneendof a spiral coil 19 arranged in the chamber 2| around and outwardlyof the tubes of the unit-.39. The coil It extends substantially the fulllength of the chamber 29 and extending from .the end coil :11 is adischarge tube 12 which is arranged within the coil '10 and thedischarge end 13 thereof passes through a gland 14 at the top of theheader casing 22.

A suitable heating medium, such as heated water, steam -.or the like, isintroduced into the coil it through thepipe 68 to heat the transfermedium or fluid in the chamber 2| which in turn .heats the oil in thecirculating tube of the unit an, as this oil is circulated back andforth through the unit in the manner previously described.

In-this 'connection, it will be understood that, in referring toapreheater or heat exchanger, this is-doneto illustrate one adaptationand use of the :invention. The apparatus may be used for rany purposeand, in some instances, cooling agents will be used, rather than theheating agents and the various passages, tubes and chambers may beutilized :for the circulation of different types and kinds-of fluids,the important factor in the dreat exchanger or preheater being thatcontamination is avoided in the event of a break or leak in any of thecirculating tubes of the unit 30 and this is particularly desirable whenboiler water is circulated through the heating coil 10. It will beunderstood that the water or fluid in the chamber 2| and associatedchambers will be simply a city water supply or water apart from theboiler water or steam circulated through the coil 10.

It will be understood that, by removing the bolts 24 and detaching thebolts 42 from the plate 4|, the jacket including the header 35 can beremoved, thus freely exposing the unit 30 as well as the coil ii! forcleaning and repair. As and when desired, the unit 30 may also then beremoved by detaching the bolts 62 and this unit may be removal of thecoil 10. Allthiscanbe-done without disturbing connections with .thepipes 25 and L? and the pipes or other connections with .thepassages-Stand 6'5. Of course if any connections have been made with thepassages |3-.|'B-inclusive, these connections will have .tobe uncoupledbefore thecasing in can be removed, as above stated. 7

Having fully described .our invention, what .we claim as new and desire-to secure by Letters Patent is: r i

1. In preheaters employing two headers -anda casing joiningand spacingsaid headers, atube unit between the headers and .imspacedrelation tothe casing,a spiral coil encircling the .tubes of said tube unitwithinthe chamberof said-casing, means in one header only of thepreheater .for circulating'fluid and similar .mediums .through thetubesof the tube unit, the other-headenjoining-the casing through aringstructure, said coil and the chamber of said casing, and means fordetachably coupling the casing .in conjunction with said ring structurefrom the first header without disturbing the tubeunit and .coil orany ofthe connections with said first header.

2. In preheater-s employing two headersanda casing joiningandsp-acingsaid headers, a tube unit between the headers and in spacedrelation to the casing, a spiral coil encircling the tubes of saidtubeunitwithin the chamberof saidcasing, means in one header only of thepreheater for circulating fluid and similar mediums through the tubesofthe tubeunit, the other header joining the casing through a ringstructura'said coil and the chamber of said casing, means for-detachablycoupling the casing in conjunction with said ring structure from thefirst header without disturbing the tube unit andcoil or any of theconnections withsaid firstheadenand means for detachablycoupling thetube unit with said first named header.

3. A preheater of the class described comprising an outer casing,headers detachable .with :respect to ends of the casing, one headerbeing directly and :detachablycoupled with one end or" the casing, aring structure detachably coupling the-other header with the other endof the casing, a circulating tubeunit arrangedlin said saw ing in spacedrelation to the walls thereof and detachably coupled with the first,header and with the second header through said ring structure, thefirst named-header having a plurality of passages in communication withthe tubes of said unit,'one of the passages forming 'the inlet for afluid-tobe heated,.another-.passage forming an outlet for said fluid,the other header having independent chambers placing the other ends ofthe tubes of said unit in communication, a spiral coil arranged in saidcasing and around the tubes of said unit, means in the first namedheader supporting inlets and outlets for said coil to providecirculation of a heating medium through the coil, means on the firstnamed header for introducing a heat transfer medium into said casingaround said tubes and coil, and means for detaching said casing, withthe ring structure thereon, from the first named header withoutdisturbing any of the fluid connections with the first named header andthe tube unit and said coil.

NATHAN A. ARVINS.

ABRAHAM A. ARVINTZ.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

